Take a look at the switches in your home. A three way switch has no marking because there is no consistent on or off position.
How To Wire Switches
Difference between 2 way and 3 way light switch. This type of switch must be combined between two three way switches to form a circuit. These switches have hot wires. These switches use only 2 types of wires. When they are connected the switch is on in a three way switch the top terminal connects to one or the other of the bottom two terminals. These have onoff switches. Installing 2 way switches are easy.
These switches use 3 types of wires. The on off can change depending on the position of the second three way switch. In north america for some odd reason a two way. A four way switch is similar to a three way except it has four terminals plus a ground terminal and controls one fixture from three locations. These switches dont have hot wires. These switches actually have 4 terminals.
While more uncommon this is a good option for large rooms with several entrances. A pair of two way switches is used to allow a lamp to be operated from two different locations such as from the bottom or top of a staircase. Single pole switches with one switch controlling one light are marked with an on and off position. Do not have an onoff switch. These switches have 3 terminals. In a normal switch the two terminals are either connected as shown or disconnected.
Gallery of Difference Between 2 Way And 3 Way Light Switch
